This paper describes the design and test of a radiating system for impulse-like waveforms. The antenna is a 3.66 meter diameter paraboloidal reflector fed by a pair of conical TEM feed structures. The pulse generator that feeds the TEM structures incorporates an electromagnetic lens to ensure a near-ideal spherical TEM wavelaunch, and a - 120 kV, 100 atm. hydrogen switch operating in burst mode at up to 200 Hz. The antenna radiates a waveform which is the time-derivative of the double...
Topics: DTIC Archive, PULSE SCIENCES INC SAN LEANDRO CA, *WAVEFORMS, ANTENNA RADIATION PATTERNS,...
The US military relies on communication devices to manage and control operations. It is important to find the susceptibility of friendly-force assets to insure command and communication in an often uncontrolled electromagnetic spectrum. Likewise, it is crucial to explore the enemy s susceptibility. Simulation of electromagnetic devices is often performed in a high-frequency structural simulator (HFSS). However, the complete susceptibility analysis cannot be performed in HFSS due to...
Topics: DTIC Archive, ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM, *ELECTROMAGNETIC SUSCEPTIBILITY,...
The report is concerned with an evaluation and an experimental study of the radiation patterns, power gain, and voltage standing wave ratio of balanced and unbalanced spiral antennas when operated at wave-lengths much longer than would be considered normal for this size structure. The unbalanced antenna which was studied was a bifilar logarithmic spiral constructed on a dielectric cone with an inner metal core to house electronic equipment. At the base, one arm is bonded to the core.
Topics: DTIC Archive, Dyson, John D, ILLINOIS UNIV AT URBANA ANTENNA LAB, *ANTENNA RADIATION PATTERNS,...
The report describes the work performed during the second quarter of a study of a reflector antenna that provides zoom (variable beamwidth) and scan capability using controlled aperture amplitude and phase. The antenna consists of a primary reflector (paraboloid) and a secondary reflector/lens. It operates as a lens in conjunction with one feed for scanning in the receive mode and as a reflector in conjunction with another feed for zooming in the transmit mode. Switching between a zooming...
Topics: DTIC Archive, DeSize, Lorne K, AIRBORNE INSTRUMENTS LAB DEER PARK NY, *REFLECTORS, *ANTENNA ARRAYS,...
In a previous report, details of the analysis of a curved dielectric radome using geometrical optics were considered for a point source. In this report, we first consider the transmission of a spherical or plane wave through a curved dielectric interface. The transmitted field is proportional to the product of the conventional Fresnel's transmission coefficient and a divergence factor DF, which describes the cross-sectional variation (convergence or divergence) of a ray pencil as the latter...
Topics: DTIC Archive, Lee, S W, ILLINOIS UNIV AT URBANA ELECTROMAGNETICS LAB, *RADOMES, *RADAR ANTENNAS,...
A towed side-scan sonar with a 2 nautical mile (NM) range would permit a hydrographic survey ship to sweep a 4nm swath for navigation hazards. The increased track spacing made possible by such a system would result in substantial savings in ship time. A conical, rather than a fan-shaped, beam would be required in coastal waters because of the proximity of the ocean surface and floor relative to the sonar range. For isovelocity water with sufficient wave height to make insonification of the...
Topics: DTIC Archive, Moss,George J , Jr, NAVAL OCEAN RESEARCH AND DEVELOPMENT ACTIVITY NSTL STATION MS,...
The study of the shape and transition of an antenna at high frequency is a fundamental problem to be considered in its design if a reasonable performance is to be expected. Some experimental results are given regarding shape and transition at 76-80 GHz. (Author)
Topics: DTIC Archive, Chang,A, ILLINOIS UNIV AT URBANA ELECTROMAGNETICS LAB, *Antennas, *Dielectric...
Prior to widespread use of adaptive, multiple-beam, etc., antennas in communication and radar systems, most antenna systems were relatively simple devices. Their performance could be accurately assessed by the measured antenna gain, principal plane sidelobe level, radiation impedance, and far zone polarization. In contrast, current day antenna systems can be so complex that human ability to study the measured performance data is not adequate to determine, in an objective manner, which of more...
Topics: DTIC Archive, Ricardi,Leon J, MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *ADAPTIVE SYSTEMS,...
Topics: DTIC Archive, Dmitrenko,D A, FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH, *ANTENNA RADIATION...
This report is a Program Performance Specification (PPS) for a digital computer program that calculates the radar signatures of ships. The PPS will be used to guide the program through three development phases and acceptance testing. The primary objectives of the program are accuracy, flexibility of application, ease of modeling, and portability. The ship is modeled by identifying and defining all the geometrical shapes which cause radar scattering and coherently adding the signals from all the...
Topics: DTIC Archive, Toothman,H L, NAVAL RESEARCH LAB WASHINGTON DC, *RADAR TARGETS, *RADAR SIGNATURES,...
The report presents the results of studies involving (1) the effects on far-field antenna performance of obstacles located in the near-field of an antenna, and (2) derivation of statistical models for predicting the out-of-band performance of waveguide phased-array antennas. In the first area, empirical data were recorded to determine the degrading effects of near-field blocking obstacles and reflecting objects on gain loss (decoupling), beamshift, beamwidth, and sidelobe levels of microwave...
Topics: DTIC Archive, Cain, F. L., Cown, B. J., Weaver, E. E., Ryan, C. E., GEORGIA INST OF TECH ATLANTA...
A three-dimensional drive simulator for the prediction of Land Mobile Satellite Service (LMSS) multipath propagation was developed. It is based on simple physical and geometrical rules and can be used to evaluate effects of scatterer numbers and positions, receiving antenna pattern, and satellite frequency and position. It is shown that scatterers close to the receiver have the most effect and that directive antennas suppress multipath interference.
Topics: NASA Technical Reports Server (NTRS), LAND MOBILE SATELLITE SERVICE, MULTIPATH TRANSMISSION,...
The scattering from coated, conducting structures, specifically the coated dihedral corner reflector configuration and the coated strip/plate configuration is examined. The formulation uses impedance-wedge Uniform Theory of Diffraction scattering coefficients to calculate the diffracted fields. A finite-thickness coating is approximated using the impedance boundary condition to arrive at an equivalent impedance for the coating. The formulation of the impedance wedge coefficients is outlined....
Topics: NASA Technical Reports Server (NTRS), ANTENNA RADIATION PATTERNS, COATINGS, DIFFRACTION, HORN...
The Laser Interferometer Space Antenna (LISA) consists of three spacecraft in orbit about the sun. The orbits are chosen such that the three spacecraft are always at (roughly) the vertices of a equilateral triangle with 5 million kilometer leg lengths. Even though the distances between the three spacecraft are 5 million kilometers, the expected phase shifts between any two beams, due to a gravitational wave, only correspond to a distance change of about 10 pico meters, which is about 10(exp -5)...
Topics: NASA Technical Reports Server (NTRS), ANTENNA RADIATION PATTERNS, FAR FIELDS, GRAVITATIONAL WAVES,...
This manual explains the theory and operation of the finite-difference time domain code FDTD-ANT developed by Analex Corporation at the NASA Lewis Research Center in Cleveland, Ohio. This code can be used for solving electromagnetic problems that are electrically small or medium (on the order of 1 to 50 cubic wavelengths). Calculated parameters include transmission line impedance, relative effective permittivity, antenna input impedance, and far-field patterns in both the time and frequency...
Topics: NASA Technical Reports Server (NTRS), ANTENNA RADIATION PATTERNS, COMPUTATIONAL ELECTROMAGNETICS,...
The paper presents a feasibility study on optically transparent patch antennas with microstrip line and probe feeds. The two antennas operate at 2.3 GHz and 19.5 GHz respectively. They are constructed from a thin sheet of clear polyester with an AgHT-8 optically transparent conductive coating. The experimental results show good radiation patterns and input impedance match. The antennas have potential applications in mobile wireless communications.
Topics: NASA Technical Reports Server (NTRS), ANTENNA RADIATION PATTERNS, PATCH ANTENNAS, MICROSTRIP...
A directional radio-frequency identification (RFID) tag reader has been designed to facilitate finding a specific object among many objects in a crowded room. The device could be an adjunct to an electronic inventory system that tracks RFID-tagged objects as they move through reader-equipped doorways. Whereas commercial RFID-tag readers do not measure directions to tagged objects, the device is equipped with a phased-array antenna and a received signal-strength indicator (RSSI) circuit for...
Topics: NASA Technical Reports Server (NTRS), ANTENNA RADIATION PATTERNS, RADIO FREQUENCIES, READERS,...
An improved method of calibrating a large directional radio antenna of the type used in deep-space communication and radio astronomy has been developed. This method involves a raster-scanning-and-measurement technique denoted on-the-fly (OTF) mapping, applied in consideration of the results of a systematic analysis of the entire measurement procedure. Phenomena to which particular attention was paid in the analysis include (1) the noise characteristics of a total-power radiometer (TPR) that is...
Topics: NASA Technical Reports Server (NTRS), CALIBRATING, ANTENNA RADIATION PATTERNS, DIRECTIONAL...
The geometrical theory of diffraction (GTD) is employed to analyze the radiation from a perfectly-conducting rectangular cylinder illuminated by an array of line sources. The excitation of the cylinder by a single electric or magnetic current line source is considered first, and a solution which includes contributions from the geometrical optics rays and all singly- and doubly-diffracted rays is obtained. A new diffraction coefficient valid in the transition regions of the shadow and reflection...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT ANTENNAS, ANTENNA RADIATION PATTERNS, CYLINDRICAL...
The results pertaining to the tradeoff analysis and performance of the Ku-band shuttle antenna pointing and signal acquisition system are presented. The square, hexagonal and spiral antenna trajectories were investigated assuming the TDRS postulated uncertainty region and a flexible statistical model for the location of the TDRS within the uncertainty volume. The scanning trajectories, shuttle/TDRS signal parameters and dynamics, and three signal acquisition algorithms were integrated into a...
Topics: NASA Technical Reports Server (NTRS), DIRECTIONAL ANTENNAS, PERFORMANCE PREDICTION, SPACE SHUTTLES,...
There are many factors affecting the spaced antenna drift results, only one of which is antenna spacing. Generally, good results are obtained at MF for receiver antenna spacings of 1-1.5 lambda, and at VHF (e.g., SOUSY) for spacings approx. 6 lambda. Since one of the factors, local atmospheric/ionospheric conditions, are difficult to predict, this paper will be restricted to a short discussion of relevant factors, and methods for comparing various antenna/analysis configurations.
Topics: NASA Technical Reports Server (NTRS), ANTENNA ARRAYS, DRIFT (INSTRUMENTATION), SPACETENNAS, ANTENNA...
Articles are presented which are concerned with the development of special test equipment and a dual-frequency zero delay device (ZDD) that were required for range tests and the measurement of ground station delays for the Mariner-Venus-Mercury 1973 S/X-band experiment. Test data obtained at DSS 14 after installation of the ZDD on the 64-m antenna are given. It is shown that large variations of range were observed as a function of antenna elevation angle and were sensitive to antenna location....
Topics: NASA Technical Reports Server (NTRS), DELAY LINES, MARINER VENUS-MERCURY 1973, RANGEFINDING,...
A mathematical tool is developed for evaluation of antenna radiation pattern effects on the shuttle orbiter S band quad antennas. A ray optics approach is used which includes multiple internal reflections with special consideration to reflection from the metallic orbiter skin. Significant depolarization may occur as the angle from the normal increases. The effect of changing tile thickness on the beamwidth of the upper quads versus the lower quads results in a small increase in the lower quad...
Topics: NASA Technical Reports Server (NTRS), ANTENNA RADIATION PATTERNS, DIELECTRICS, RADAR ANTENNAS,...
The pointing control loops of the Deep Space Network 70 meter antennas extend only to the Intermediate Reference Structure (IRS). Thus, distortion of the structure forward of the IRS due to unpredictable environmental loads can result in uncompensated boresight shifts which degrade blind pointing accuracy. A system is described which can provide real time bias commands to the pointing control system to compensate for environmental effects on blind pointing performance. The bias commands are...
Topics: NASA Technical Reports Server (NTRS), ANTENNA RADIATION PATTERNS, BORESIGHT ERROR, DEEP SPACE...
In recent years, researchers in electromagnetics have expended considerable effort capitalizing on computational advances made possible by new developments in computer technology. These advances have made it easier to develop highly efficient, specialized computer codes for many scattering or radiation problems. However, because of the high cost of developing a code for each specialized geometry, it has increasingly become more cost effective to use possibly less efficient, but more general...
Topics: DTIC Archive, Hwu, S U, SAN DIEGO STATE UNIV FOUNDATION CA, *GRIDS, *RADIATION PATTERNS, *MESH,...
This report covers the accuracy test of a system designed to measure, display, and record air-to-air range and bearing measurements between in-flight aircraft. Data acquired from flight tests using reference measurements described in the report showed the estimated standard deviation range of error to be 100 feet, reducible to 60 feet via software smoothing of data. The standard deviation of bearing error was 2.4 . It is concluded that the system is well within specifications. (Author)
Topics: DTIC Archive, Luciani,Vincent J, NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N...
This report describes a new vertically polarized cavity-type antenna with a cardioid pattern steerable in the horizontal plane. The front-to-back ratio is better than 15 dB over a 25% bandwidth and better than 20 dB within half that total bandwidth. The average gain is approximately 2 dB above a monopole and the VSWR<2 except at the very end of the band. The beamwidth in the front as well as the nullwidth in the back is so wide that the beam is directed only in the four cardinal...
Topics: DTIC Archive, Munk, B. A., OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB, *BEAM STEERING, *CAVITIES,...
Side-lobe levels due to blockage effect of the boom connecting the feed to the lens of the space-based radar antenna are estimated. Also, the effect of antenna stays on side-lobe levels is calculated. It is shown that side-lobe levels exceeding -50 dB are produced by the boom. (Author)
Topics: DTIC Archive, Fante,Ronald L, ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY, *RADAR ANTENNAS,...
This paper describes the application of biologically-inspired algorithms and concepts to the design of wideband antenna arrays. In particular, we address two specific design problems. The first involves the design of a constrained-feed network for a Rotman-lens beamformer. We implemented two evolutionary optimization (EO) approaches, namely a simple genetic algorithm (SGA) and a competent genetic algorithm. We conducted simulations based on experimental data, which effectively demonstrate that...
Topics: DTIC Archive, Santarelli, Scott G, AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE,...
Much time and effort has been applied to accurately model aperture- fed stacked patch microstrip antennas at the Air Force Institute of Technology (AFIT). The results of this study provide AFIT with the capability to fabricate and measure these antennas for comparison of measured radiation characteristics to the predicted characteristics. Basic microstrip patch antenna theory is reviewed, as well as the motivation leading to the development of aperture-fed stacked patch microstrip antennas. The...
Topics: DTIC Archive, Terry, Christopher I, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF...
A general and convenient method was provided for determining incremental length diffraction coefficients directly from the conventional two- dimensional diffraction coefficients. This sequel provides a detailed analysis of how the nonuniform incremental diffraction coefficients for the half-plane are integrated around the rim of a reflector. These computed far fields of the nonuniform current, when added to the far fields computed from the physical optics current, produce a more accurate total...
Topics: DTIC Archive, Shore, Robert A, ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY, *DIFFRACTION, *ANTENNA...
A solution of Maxwell's equations is obtained for an antenna consisting of an infinite number of equally spaced wires in the form of coplanar equiangular spirals. Radiation amplitude patterns obtained from this solution agree closely with measurements on two-element spiral antennas. The phase pattern shows the approximate validity of a phase center at a distance behind the antenna which decreases with the tightness of the spiral. The current distribution shows increased attenuation with...
Topics: DTIC Archive, Cheo, B. R., CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *SPIRAL ANTENNAS,...
The east-west aperture of the El Campo Solar Radar Antenna was doubled. Mechanical and electrical improvements incorporated at the time of the expansion, together with the increased size, resulted in an increase in gain of approximately 3-1/4 db.
Topics: DTIC Archive, MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *DIPOLE ANTENNAS, *RADAR ANTENNAS,...
This report presents a method for synthesizing a given radiation field magnitude pattern for a reactively loaded circular dipolar array. The reactively loaded circular dipole array has the center dipole fed and the outer dipoles parasitically excited with reactive loads across their input terminals. Both seven and thirteen element arrays are considered. A Rosenbrock optimization algorithm is applied directly to the synthesis error function to determine the reactive loads required for minimum...
Topics: DTIC Archive, Luzwick,John, SYRACUSE UNIV N Y DEPT OF ELECTRICAL AND COMPUTER ENGINEERING, *ANTENNA...
A Traffic Control and Landing Systems (TRACALS) Communications Station Evaluation was performed at Ellsworth AFB, South Dakota (2184 Comm Sq) from 27 March thru 4 April 1978. The purpose of the evaluation was to define the capabilities and limitations of the communications system servicing the radar approach control (RAPCON) and control tower. Included in this report are the results and analysis of equipment checks, system line-level diagrams, line-of-sight coverage data, analysis of airborne...
Topics: DTIC Archive, Mathews,Allen C, FACILITY CHECKING SQUADRON (1866TH) (AFCS) SCOTT AFB IL, *AIR...
The research in this program is in the area of electromagnetics. The specific topics are: (1) Diffraction studies; (2) Hybrid techniques; (3) Antenna studies; (4) Time domain studies; (5) Adaptive array studies; and (6) Laser induced transients.
Topics: DTIC Archive, OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB, *ANTENNA RADIATION PATTERNS,...
The canonical problem of plane wave scattering by a perfectly-conducting circular cylinder is analyzed, and a uniform asymptotic result is presented for the field within the transition regions adjacent to the shadow boundaries where the ordinary ray solutions fail. This result provides a finite and continuous total field across the shadow boundaries. Exterior to the transition regions it reduces to the GTD solution in terms of the surface diffracted and the geometric optical (incident and...
Topics: DTIC Archive, Pathak,P H, OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB, *Electromagnetic scattering,...
In this investigation two approaches have been studied, both theoretically and experimentally. The first investigation is made on annular microstrip antennas. As seen from the cavity model theory, an antenna of this type, if excited for (1,1), (1,2) and (1,3) modes, will have predominantly broadside radiation of the same polarization. However, unlike disc or rectangular patches, the resonant frequencies for these modes are not fixed ratios, being dependent on the dimensions of the inner and...
Topics: DTIC Archive, Lo,Y T, ILLINOIS UNIV AT URBANA DEPT OF ELECTRICAL ENGINEERING, *STRIP TRANSMISSION...
The overall scope of the program on Contract No. N00123-76-C-1371 between The Ohio State University ElectroScience Laboratory and the Naval Electonics Laboratory Center is to develop the necessary theory,l algorithms and computer codes for simulating antennas at UHF and above in a complex ship environment. The work consists of (a) basic scattering code development, (b) reflector antenna code development, (c) basic studies to support items (a) and (b).
Topics: DTIC Archive, Kouyoumjian,R G, OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB, *Ship antennas,...
Communications satellites located in geosynchronous orbits will, in addition to more specialized shaped beam of area coverage antennas, generally utilize earth coverage antennas designed to maximize antenna gain over the entire surface of the visible earth. In the microwave and millimeter wave bands, these antennas are usually conical horns which achieve a minimum gain (G(min)) of 17 - 17.5 dBi at the limb of the earth. This paper describes the design of a single mode (ME(11)) earth coverage...
Topics: DTIC Archive, Weikle,Dennis C, MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *Satellite...
A 4 x 4, 17.5 GHZ Monolithic Phased Array fabricated on high resistivity silicon is described. This approach combines microstrip antenna elements, beam lead PIN diodes and silicon integrated circuit technology to replace labor intensive hybrid circuit construction techniques with low cost, repeatable integrated circuit processes. Preliminary test data from two hardware iterations is presented. Although the program is formally concluded, additional testing is still being conducted to...
Topics: DTIC Archive, Burlingame,P J, BALL AEROSPACE SYSTEMS DIV BOULDER CO, *INTEGRATED CIRCUITS,...
The use of vector analysis for deriving algorithms for generating earth coverage footprints from satellites in arbitrary orbits is presented. Extensive analysis and results are given for two examples: 1) a satellite in geosynchronous orbit and 2) a satellite in subsynchronous orbit. The antenna beam on the satellite can be elliptic in cross section with arbitrary orientation of semi-minor and semi-major axes.
Topics: DTIC Archive, Ott,R H, AEROSPACE CORP EL SEGUNDO CA ELECTRONICS RESEARCH LAB, *ANTENNA RADIATION...
A broad-band array of aperture-coupled cavity-backed slot (CBS) elements was designed, constructed and tested. The antenna array design incorporated two major departures from previous CBS arrays; aperture coupling, and 'half-width' cavities. Experimental results demonstrated these departures enhance the potential for larger operating bandwidths using less physical space than previous arrays of CBS elements. Computer simulation and test results also indicated that the antenna array was not...
Topics: DTIC Archive, Burns, Joseph M, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH, *ANTENNA ARRAYS,...
The radiation from slot antennas on a cone in the presence of an inhomogeneous sheath is treated. The sheath is considered as being made up of one or two conical layers, each of which is homogeneous. The boundary conditions lead to a system of integral equations, which number 4M + 4 for a sheath composed of M(=1 or 2) conical layers. These are reduced to singular integral equations of Cauchy type, which are solved in iterative fashion. For sufficiently fine stratification of the sheath, the...
Topics: DTIC Archive, Katzin, M, ELECTROMAGNETIC RESEARCH CORP COLLEGE PARK MD, *ANTENNA RADIATION...
Patch antennas are enablers in wireless applications due to their manufacturability, conformability, low cost, and low weight. However, they have narrow bandwidths and fixed operating frequencies that limit their utility when frequency agility is critical. The solution is a tunable patch antenna that retains the desirable features of its fixed frequency counterparts. Patch antennas can be tuned without changes in geometry through loading with variable capacitors or inductors. These components...
Topics: DTIC Archive, NAVAL ACADEMY ANNAPOLIS MD, *ANTENNAS, *MICROELECTROMECHANICAL SYSTEMS, *TUNING,...
This Space Communications-Division 6 Quarterly Technical Summary covers the period 1 June through 31 August 1977. It includes satellite communications work performed within Divisions 6 and 7. Other work in Division 6 is reported separately.
Topics: DTIC Archive, Reiffen, Barney, Niessen, Charles W., MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN...
This report describes a stochastic model and a simulation of low grazing angle, forward scatter, over-water multipath applicable to microwave frequencies. The model is based primarily on the work of Charles Beard, using a coherent and an incoherent vector summation to describe the reflected signal. A second order stochastic model and an associated stochastic simulation are described. Controlling parameters are sea state, radar frequency, transmitter/receiver geometry, and radar antenna...
Topics: DTIC Archive, Northam, D. Y., NAVAL RESEARCH LAB WASHINGTON DC, *MULTIPATH TRANSMISSION, *FORWARD...
This paper presents an analysis of an electrically small archimedean spiral. Method of moment calculations were performed to find the spiral arm current distribution, and optimum arm road impedance over a three-to-one bandwidth. (AN)
Topics: DTIC Archive, Neel, Michael M., NAVAL AIR WARFARE CENTER WEAPONS DIV CHINA LAKE CA, *SPIRAL...
The Federal Aviation Administration (FAA) Fixed Ground Antenna Radome (FCAR) Operational Test and Evaluation (OT&E) Integration and Operational Test Plan is prepared by the Associate Program Manager for Test (APMT). It defines the overall planning, test activities, and coordination associated with OT&E Integration and Operational testing required to ensure the project meets the requirements of the project specification and the system and subsystem requirements allocated to the project....
Topics: DTIC Archive, Baker, Leonard H., FEDERAL AVIATION ADMINISTRATION TECHNICAL CENTER ATLANTIC CITY NJ,...
Under this Air Force grant we have begun the investigation into the ability of the embedded impedance elements to control the far field phase of an individual element with the anticipation that this element can be incorporated into an array and used in a manner of similar to phase steered array using external phase shifters. The advantage of this approach is that the phase shifting devices are embedded in the antenna and are extremely simple in composition. This eliminates several connections...
Topics: DTIC Archive, Thursby, Michael H., FLORIDA INST OF TECH MELBOURNE, *STRIP TRANSMISSION LINES,...
